Dog stair



FIG. 1 is a top perspective view of a dog stair, showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a front elevational view thereof, the rear elevational view being a mirror image of FIG. 3 ;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the figures are for the purposes of illustrating portions of the dog stair, which form no part of the claimed design. 

CLAIM The ornamental design for a dog stair, as shown and described. 